The Microsoft Input/Output Stream Classes (iostream.hlp) (Table of Contents; Topic list)
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istream::putback
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──The Microsoft iostream Classes────────────────────────────────────────────
 
  istream& putback( char ch );
 
  Parameter   Description
 
  <ch>        The character to put back; must be the character previously
              extracted.
 
  Remarks
 
  Puts a character back into the input stream. The putback function may
  fail and set the error state. If <ch> does not match the character that
  was previously extracted, then the result is undefined.
 
 
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